My Row Editing Plugin event handlers are gone

My Row Editing Plugin event handlers are gone

I'm using a grid with the row editing plugin that had beforeedit and edit event handlers. With build 286, the event handlers no longer show up in the project inspector, and I can't add new event handlers to the plugin. The code for the handlers is still present and gets deployed correctly, but now I have to edit that code outside of Designer.

To make sure it wasn't a problem specific to my project, I created a new project with a grid and the plugin and got the same results - you can't add event handlers to the plugin by clicking the "+" symbol next to the event name.